"This publication is largely compiled from and supersedes the following publications on medicinal plants by the late Alice Henkel, published from 1904 to 1913: Farmers' bulletin no. 188, Weeds used in medicine; Bureau of plant industry Bulletins no. 107, American root drugs; no. 139, American medicinal barks; and no. 219, American medicinal leaves and herbs; Department bulletin no. 26, American medicinal flowers, fruits and seeds."
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